39乘4份之一加27乘0.25加34乘25%

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因为4分之早穗一=0.25=25%
原式伏睁汪=（缺仔39+27+34)×0.25
=[（39+1)+(27+33)]×0.25
=100×0.25
=25

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39*(1/配昌塌培圆迅颂4)+27*0.25+34*25%
=39*0.25+27*0.25+34*0.25
=(39+27+34)*0.25
=100*0.25=25

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（39＋27＋34）×0.25＝25

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